"Grassy" Spike Rush (Eleocharis acicularis) aka "Thread Grass" or "Sterile Thread-Like Leaf"

"Grassy spike rush" is a submerged, thread-like, sterile version of the emergent spike rush plant. It is common in shallow portions of the lake and often forms large areas of “grassy” bottom growth, with stems reaching lengths of 1-2 feet. Identification by Amy Smagula. Photos by Bill Petry and Don Yurewicz